The quality of reading promotion in colleges and universities is related to the construction of scholarly campus and the cultivation of talents. In this paper, the concept of "diagnosis and improvement" is introduced to analyze the connotation and motivation of the quality diagnosis and improvement of reading promotion. On the basis of clarifying the elements of quality diagnosis and improvement, and taking Deming cycle (PDCA) as the basic model, The "8"-shaped spiral and the "three horizontal and five vertical" system of quality diagnosis and improvement for reading promotion in colleges and universities are constructed.